1/* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5/* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22package com.sun.org.apache.xalan.internal.xsltc.compiler; 23 24import com.sun.org.apache.xalan.internal.xsltc.compiler.util.BooleanType; 25import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; 26import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg; 27import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; 28import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; 29import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; 30import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util; 31 32/** 33 * @author Jacek Ambroziak 34 * @author Santiago Pericas-Geertsen 35 * @author Morten Jorgensen 36 */ 37final class When extends Instruction { 38 39 private Expression _test; 40 private boolean _ignore = false; 41 42 public void display(int indent) { 43 indent(indent); 44 Util.println("When"); 45 indent(indent + IndentIncrement); 46 System.out.print("test "); 47 Util.println(_test.toString()); 48 displayContents(indent + IndentIncrement); 49 } 50 51 public Expression getTest() { 52 return _test; 53 } 54 55 public boolean ignore() { 56 return(_ignore); 57 } 58 59 public void parseContents(Parser parser) { 60 _test = parser.parseExpression(this, "test", null); 61 62 // Ignore xsl:if when test is false (function-available() and 63 // element-available()) 64 Object result = _test.evaluateAtCompileTime(); 65 if (result != null && result instanceof Boolean) { 66 _ignore = !((Boolean) result).booleanValue(); 67 } 68 69 parseChildren(parser); 70 71 // Make sure required attribute(s) have been set 72 if (_test.isDummy()) { 73 reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR, "test"); 74 } 75 } 76 77 /** 78 * Type-check this when element. The test should always be type checked, 79 * while we do not bother with the contents if we know the test fails. 80 * This is important in cases where the "test" expression tests for 81 * the support of a non-available element, and the <xsl:when> body contains 82 * this non-available element. 83 */ 84 public Type typeCheck(SymbolTable stable) throws TypeCheckError { 85 // Type-check the test expression 86 if (_test.typeCheck(stable) instanceof BooleanType == false) { 87 _test = new CastExpr(_test, Type.Boolean); 88 } 89 // Type-check the contents (if necessary) 90 if (!_ignore) { 91 typeCheckContents(stable); 92 } 93 94 return Type.Void; 95 } 96 97 /** 98 * This method should never be called. An Otherwise object will explicitly 99 * translate the "test" expression and and contents of this element. 100 */ 101 public void translate(ClassGenerator classGen, MethodGenerator methodGen) { 102 final ErrorMsg msg = new ErrorMsg(ErrorMsg.STRAY_WHEN_ERR, this); 103 getParser().reportError(Constants.ERROR, msg); 104 } 105} 106